Martin O’Malley is a former governor of the state of Maryland and a former mayor of Baltimore, a city in Maryland. He also plays in a Celtic rock band.

Mr. O’Malley is not well known nationally. Experts say he does not have a chance to win the Democratic nomination unless the Hillary Clinton campaign suffers serious problems.

Mr. O’Malley has a record of supporting liberal issues. He hopes people wanting a fresher and younger face will give him their votes. And, he is trying to appeal to people in the working class people who have middle or low incomes. But he does not have wide support.

Mr. O’Malley faces problems over recent protests in Baltimore because he was once the city’s mayor. The protests came after a young African-American man died while police detained him. But Baltimore residents said the protests were also about a history of poverty, conflicts with police and other issues in the city. Mr. O’Malley announced his candidacy on May 30 2015.